Screening apparatus



W. E. NICKERSON June 12, 1923.

SCREENING APPARATUS Filed Aug. 26

1918 5 Sheets-Sheet 1 W.- E. NECKERSON June 112, 1923.

SCREENING APPARATUS 5 Sheets-Sheet 2 Filed Jmme 1112,1923. MS M W. E. NECKER5ON SCREENING APPARATUS Filed Aug 26. 1918 5 Sheets-Sheet 5 June 112, 19.23..

W. E. NECKERSQN SQREEHING APPARATUS Fried Rug.- 2e 1918 5 Sheets-Sh eet- 4 I WVE/v TQR: Hi S. Wm,

' 19/5 43?- ramp/s7 June: 12, 1923. 1,45%,4-34 Y W. E. NICKERSON SCREENING APPARATUS Fi'1 ed Aug. 26, 1918 5 Sheets-Sheet 5 Patented June 122, i923.

unites SAFETY RAZOR GOT7IANY-, DELAWARE.

OF BOSTON, ltfASSACHUSE'iFTS,

oonronn'rron or soannr'rrne erranarus.

Application filed August 26, 1918. Serial No. 251511.

To all whom, it may concern:

Be it known that 1, WILLIAM E. NICKER- son, a citizen of the United States, residing at Cambridge, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Screening Apparatus, of which the following is a specification.

, My invention relates to screens such as are used for separating materials of different degrees of fineness from each other, and re sides in certain features of construction and arrangement hereinafter described which collectively provide a rotary screen capable of operating continuously, uniformly and effectively so long as it is kept supplied with the mixed materials to be separated. A screening apparatus embodying my invention and suitable for the separation of small metallic articles from s saw-dust or other finely divided material in which they have been tumbled is illustrated in the accompanying drawings, in which:

Figure 1 is a side elevation of the apparatus, as preferably constructed;

Figure 2 is a central longitudinal section through the body portion of the apparatus, the plane-of section being vertical;

Figure 3 is a view similar to Figure 2, showing one end of the body portion on a larger scale;

Figure i is an elevation, partly in section, of a removable receptacle whereby the body portion is supplied with the mixed materials;

Figure 5 is a transverse section on the line 55 in Figure 1;

Figure 6 is a transverse section on the line 6-6 in Figure 1;

Figure 7 is an elevation of the receiving end of the apparatus, with the removab e receptacle omitted; and t Figure 8 is an elevation of the discharge end of the apparatus.

The body portion of the apparatus illustrated consists of a cylindrical screen 2, adapted to rotate on its longitudinal axis, and a concentric casing 23 which surrounds and rotates with the screen 2 and is of some what larger diameter, so that an annular space is provided between them. The screen 2 is shown as having a considerable length as compared with its diameter, and is provided with numerous perforations e of a size suitable vfor retaining the metallic articles within the screen and permitting the sawdust or other finely divided material to pass into the casing 3. It is also provided internally with laterallypaced diametrical rods 5 extending in alternation at right angles to one another, the purpose of which is hereinafter described. Atone end the screen 2 carries a head 6 provided with outlet openings 7 and a central shaft 8, and at its opposite end it is inserted into a tubular head 9 having an outwardly-extending re duced portion 10 which is concentric with the longitudinal axis of the screen. The shell 8 is shown as composed of two sections over-lapped at their adjacent ends and connected by radial screw bolts 11, which hear at their inner ends on the screen 2 and serve as spacers to hold the shell and screen at the desired distance from each other. Similar screw boits 12 perform the same spacing function at the other end of the outer section of the casing. At its opposite end the cusing 3 is mounted on the head 9 and is connected thereto by bolts 13, which also con nectthe head 9 to the screen 2 as shown in Figure 3. 14 and 15' indicate reinforcing rings surrounding the casing atthe points where the bolts 11 and 12 pass through it.

The parts above described are carried by two frames 16 and 1.7, one at each end of the screen, in such position that the axis of the screen slants downward slightly frcm its receiving end to its discharge end. The frame 16 is located at the discharge end of the screen and carries a journal bearing 18 in which the shaft 8 turns and by which this end of the screen is supported. The other end of the screen is supported by a roller 19 journaled on the frame 17 on an axis substantially parallel withthe longitudinal axis of the screen and directly beneath the head 9, which is provided with an annular groov 20 to receive the periphery of the roller. Lateral movements of the screen are prevented by a pair of idle rollers 21 mounted on a ring-shaped bracket 22 carried by and extending upward from the frame 17, these rollers being located on opposite sides of and in contact with the reduced portion 10 of the head 9, which passes freely through the central opening in the bracket 22 as shown in Figures 1 and 7. The screen is rotated by means of the roller 19, which is provided belt pulleys 26 V manipulation.

. reaches and falls screen 2 are fed along the latter and with a bevel gear 24 on a driving frame 17 and 23 meshing with a pinion shaft 25 journaled in the provided with fast and loose and 27, to which power may be transmitted from any suitable source.

The mixed materials to be operated upon are introduced into the screen by means of a removable receptacle 28 shown in upright position in Figure l. This receptacle is cylindrical in form of a diameter to fit freely within the reduced portion 10 of the head 9 and is preferably provided near its closet end with a pair of handles 29 to facilitate its When the receptacle is inserted into the head 9, as shown in Figure 1, it is inclined downward toward its open end at the same angle as the screen itself and rotates with the latter,"with"the result-that the materials previously placed in it are fed gradually into and along the length of the screen. During this movement the. mixed materials are thoroughly agitated by the diametrical rods 5-and the liner material is sifted out through the perii'orations 4 and de posited in'the casing 3, in which it is fed along by the rotation of the casing until it through one or another of a number of apertures 30 formed therein and arranged to discharge the material into one or more stationary troughs 31. each pro-' videdat itsbottom with an outlet opening 32 which leads into a downwardly extending funnel 33 carried by the trough. The'gieater part of the line material sifted out by the screen is discharged through the funnels into suitable receptacles placed beneath them the remainder, if any, being discharged through the open end of'the casing 8, where it may be received in another placed at this point. feeding and the Y articles receptacle Concurrently with the discharge of the line material separated therefrom by the eventually discharged through the openings 7 in the headb whence they fall into an inclined chute 3 lsupported by the frame 16 and adapted to deliver the articlesinto a suitable receptacle placed beneath its lower end.

In the construction illustrated there are two of thetroughslll, each of which has an annular contour and completely surrounds the casing 23, close to-but out ofcontact with it. This form of trough is advan-v itageous in case the mixed materials contain an ingredient so light and powdery that it is capable of remaining in suspension in the air and is therefore liable to be carried'out of of the apparatus by air currents. In such case the troughs above described substantially control the movement of the powdery material in suspension and prevent it from escaping from the apparatus"except at the intended points of discharge. means to the same end each trough 31 may be provided With a tubular extension 35 versely-extending" in the adjustment of the rods 40 by As a further The rate of feed of the materialswill (le pend in part upon-the rate of rotation of the screen and in part upon the angle of inclination of its axis, and in order that the rate of feed 'ina-y be regulated to suit a given. mixture of materials, provision is made for rais ing and lowering one end of the screen with out interfering with its rotation. In the construction illustrated this is done at the discharge end of the screen bv mounting the journal bearing 18 on a pair of transpivots 36 carried by a bracket secured to the underside of a cross bar 38 which forms'the top of, the frame 16 and has split sockets at its ends whereby it can be adjusted verticallyon the side uprights of the. frame, thesplit ends of the cross barbeing provided with screw bolts 39 to clamp the bar in adjusted'position The slight movementimparted to the screen at its receiving end by adjustment of its discharge end is taken care of by the capacity of the head 9 to rock on the. roller I 19. The troughs 3i. areenabled to participatein such adjustment'and are thereby-kept in fixed relation to the casing3 by support- 1 ing them on parallel rods 40 extending lengthwise of the casing, one on each side,

and providing the lower ends of theserods with longitudinal slots 41 through whicn 1 passes a transversely-extending rod 42 carried at its ends by split collars 43' which can be adjusted vertically 'on the'side uprights of the frame 16 in correspondence withthe adjustment of thecress bar 38, and clamped in adjusted position by screw bolts 44. The necessary pivotal movement of the rods 40 at their opposite ends is provided for by clamping them in split sockets 45 mounted on tit'ansversely-extending pivots 46 carried by a bracket 47 which is secured to the frame 17 near the roller 19, as shown in l 'igures l and 7. The chute 734i is caused to participate sus- rod 42] with chute resting onanother transverse rod 4L8 which may be adjusted vertically like the rod 42, in order to vary the inclination of the chute as the rate of discharge of the material may require.

in using the apparatus above described 125 the receptacle 28 can be removed'from the pending it on the transverse the bottom of the I head 9. filled withthe mixed materials and resting the separation of the mixed materials 230 ischarged therefrom at any ride previously introduced into the screen. This arrangement not only enables the apparatus to operate continuously but also has the ad'- vantage that each charge or mixed mate rials is fed into the screen gradually by the rotation of the inclined receptacle 28, so that the mass on which the screen operates is kept substantially constant in volume. This results in uniformity of operation as regards thorough separation of the materials and the rate of discharge of the separated materials. Further advantages of the anuaratus are found in the completeness with which both of the separated materials are controlled and discharged at predetermined points, and in the capacity for regulation of the rate of feed by adjustment of the angle of inclination of the body portion of the,

apparatus, which can be done while it is operating. The specific apparatus illustrated is also exceedingly simple and durable in construction and can be readily taken apart if desired, but it will be understood that the details of construction can be widely varied. without departing from my invention, so far as its general characteristics are concerned.

I claim 1. In a screening apparatus, the combination with a screen of a cylindrical rotary casing surrounding the screen and provided with peripheral apertures arranged in circumit'erential series, and a trough surrounding the casing, close to but out of contact therewith, and located. in position to receive material discharged through said apertures.

2. In a screening apparatus, the combination of a long-itudinally-slanted tubular screen, a concentric tubular casing surrounding the screen at a distance therefrom and provided with apertures arranged in circumferential series, a trough surrounding the casing, close to but out of contact therewith, and located in position to receive material discharged through said apertures, and means for simultaneously rotating the screen and easing.

3. In a screening apparatus, the combination with a screen of a rotary cylindrical casing surrounding the screen and provided with peripheral apertures arranged in circumferential series, and a trough surrounding the casing, close to but out of contact therewith, and located in position to receive material discharged through said apertures, said trough being provided with an opening through which suction may be exerted.

a. In a screening apparatus, the combination with a screen of a longitudinallyslanted rotary casing surrounding the screen and adapted to collect material discharged therefrom and feed it longitudinally, said casingbeing provided at intervals with peripheral discharge apertures, means for varying the longitudinal inclination of the casing, a trough located close to the casing in position to receive material discharged through said apertures, and means for adjusting the trough to maintain its relation to the casing.

5. In a screening apparatus, the combination of a longitudinally-slanted tubular screen, a concentric tubular casing surround.- ing the screen at a distance therefrom and provided with apertures arranged in circumferential series, means for varying the longitudinal inclination of the screen and casing, a trough surrounding the casing, close to but out of contact therewith, and located in position to receive material discharged through said apertures, means for adjusting the trough to maintain its relation to the casing, and means for simultaneously rotating the screen and casing.

6. In a screening apparatus, the combination of a longitudinally-slanted tubular screen, a concentric tubular casing surrounding the screen at a distance therefrom and connected thereto, said casing being provided with peripheral apertures arranged in circumferential series, means for supporting and rotating the screen and casing on the longitudinal axis of the combined parts, a trough surrounding the casing, close to but out of contact therewith, and located in position to receive the material discharged through said apertures, supporting rods for sald trough, means for varying the inclination of the axis of the screen and casing, and means for adjusting the supporting rods to maintain the relation of the trough to the casing.

7. In a screening apparatus, the combination of a longitudinally-slanted tubular screen, means for rotating the screen on its longitudinal axis, and a receptacle open at one end and adapted to be removably inserted into the receiving end of the screen, said receptacle being rotatable with the screen.

8. In a screening apparatus, the combination of a longitudinally slanted tubular screen provided at its upper end with a concentric head whereby the screen is sup ported, means for rotating the screen and head on their longitudinal axis, said head being provided with a central opening, and a cylindrical receptacle open at one end and adapted to be removably inserted into and supported by said head, whereby it is caused to rotate therewith.

9. In a screening apparatus, the combination of a longitudinallyslanted tubular screen, means for simultaneously rotating the screen on its longitudinal axis, a cylindrical receptacle open at one end and adapted to be removably inserted into and supported by the receiving end of the screen, with its open end in position to discharge its contents into the screen, and means for varying the longitudinal inclination of the combined parts.

10. In a screening apparatus, the combination of a rotary cylindrical screen, a

- 5 cylindrical casing therefor comprising a plurality of longitudinallyseparable sections overlapped at adjacent ends, and bolts passing through the overlapped ends of said sections and engaging the screen at their inner ends, whereby the sections of the casing are secured together and spaced away from the screen.

Signed at Boston, lVIass, this 23rd day of August, 1918.

WILLIAM E, NICKERSON. 

